I remember a post on here recently which said that sometimes a high-level language can be faster than C, because you can convey more of your algorithmic intent

I remember a post on here recently which said that sometimes a high-level language can be faster than C, because you can convey more of your algorithmic intent and thus the compiler can optimize better for you. It gave an example where the compiler's knowledge that something is an immutable array means better optimization. Which you can't express in C.